Call me

Have a Query? We will call you right away.

+91

E.g: 9876543210, 01112345678

We will give you a call shortly, Thank You

Office hours: 9:00 am to 9:00 pm IST (7 days a week)

What are you looking for?

Syllabus

what is the meaning of quantisation of charge?

_{0}?_{g}. The kinetic energy of the system is: (Slipping is absent)$A)6{\omega}_{0}B)12{\omega}_{0}C)4{\omega}_{0}D)8{\omega}_{0}$

Difference between gravitational force and electrostatic force

1) -400k 2) 200j

what is the dimensional formula of epsilon not?

(1) $\frac{1}{4{\mathrm{\pi \epsilon}}_{0}}\frac{\mathrm{q}}{3\sqrt{3}{\mathrm{R}}^{2}}$ (2) $\frac{{\displaystyle 1}}{{\displaystyle 4{\mathrm{\pi \epsilon}}_{0}}}\frac{{\displaystyle 2\mathrm{q}}}{{\displaystyle 3{\mathrm{R}}^{2}}}$ (3) $\frac{{\displaystyle 1}}{{\displaystyle 4{\mathrm{\pi \epsilon}}_{0}}}\frac{{\displaystyle 2\mathrm{q}}}{{\displaystyle 3\sqrt{3}{\mathrm{R}}^{2}}}$ (4) $\frac{{\displaystyle 1}}{{\displaystyle 4{\mathrm{\pi \epsilon}}_{0}}}\frac{{\displaystyle 3\mathrm{q}}}{{\displaystyle 2\sqrt{3}{\mathrm{R}}^{2}}}$

Two similarly and equally charged identical metal spheres A and B repel each other with a force of 0.000002 N. A third identical sphere C is touched with A and then placed at the mid point between A nd B. What is the net electric force on C?

Q.28. For the path PQR in a conservative force field (fig.), the amount of work done in carrying a body from P to Q & from Q to R are 5 J & 2 J respectively. The work done in carrying the body from P to R will be -

A) 7 J

B) 3 J

C) $\sqrt{21}$ J

D) zero

Three point charges of +2 microcoulomb,-3 microcoulomb and -3 microcoulomb are kept at the vertices A,B and C respectively of an equilateral triangle of side 20 cm.What should be the sign and magnitude of the charge to be placed at the mid point(M) of side BC so that the charge at A remains in equilibrium?

Q.9. A 5 m long pole of 3 kg mass is placed against a smooth vertical well as shown in the figure. Under equilibrium condition, if the pole makes an angle of 37$\xb0$ with the horizontal, the frictional force between the pole and horizontal surface is

A) 20 N

B) 30 N

C) 20 $\mu $N

D) 30 $\mu $N

A charge q is placed at the center of the line joining two equal charges Q. Show that the system of three charges will be in equilibrium if q = -Q/4.

derive an expression for potential energy of an electric dipole in a uniform electric field .

1)Eqm/t

2)E^2q^2t^2/2m

3)2E^2t^2/m

4)Eq^2m/2t^2

difference between uniform and non-uniform electric fields.... plzz if possible draw diagrams too..!

2 point charges at distance ' r ' in air exert a force ' F ' on each other, at what distance will these charges experience the same force ' F' in a medium of dielectric constant K?

A charge "q" is placed at the centre of the cube of side "l". What is the electric flux passing through each face of the cube?

a gas is heated through 1 degree celsius in a closed vessel. its pressure is increased by 0.4%.the initial temperature of the gas is ????

An infinite number of charges each equal to q are placed along x axis at x=1 , x=2 , x=4, x=8 and so on . Find the electric field at the point where x=0 due to this setup of charges and what will be the electric field if inthe above setup the consecutive charges have opposite sign.?

_{1}, Q_{2}, Q_{3}, respectively. It is found that the surface charge densities on the outer surfaces of the shells are equal. Then, the ratio of the charges given to the shells, Q_{1}: Q_{2}: Q_{3}is : (1) 1 : 2 : 3 (2) 1 : 3 : 5 (3) 1 : 4 : 9 (4) 1 : 8 : 18what does q1+q2 =0 signify in electrostatics?

Pls provide chart for values of Sin, Cos, Tan and Cot for specific values from 30 degrees to 360 degrees.

A particle A has charge q anda particleB has charge 4q with each of them having same mass m. when allowed to fall from rest through sam potential difference , the ratio of their speed va:vb will be:

Â What is quantisation of charge?

Two infinitely long parallel wires having linear charge densities λ1 and λ2 respectively are placed at a distance of R metre. The force per unit length on either wire will be.......?

What are the limitations of Coulomb's Law ?

Four charges, each equal to Q are placed at the 4 corners of a square and a charge q is placed at the centre of the square. If the system is in equilibrium, then the value of q is?

A pendulum bob of mass of 80 mg and carrying a charge of 2 X 10

^{-}^{8}C is at rest in a horizontal uniform electric field of 20,000 V/m. Find the tension in the thread of the pendulum and the angle it makes with the vertical.Take( g = 9.8ms

^{-2})two equal point charges A and B are R distance apart. A third point charge placed on the prependicular bisector at a distance 'd' from the center will experience maximum electrostatic force when

1. d = R/2 X 1.414

2 d = R/ 1.414

3. d = R 1.414

4. d = 2 X 1.414 R

Three charges each equal to q are placed at the three corners of a square of side a. Find the electric field at the fourth corner.

a. q

b. -q

c. 2q

d. -2q

when a body becmes negatively charged , its mass

[a] decreases [b] increases

[c] remins the same [d] none of these

q. Two point charges of +16 micro coulomb and -9 micro coulomb are placed 8 cm apart in air .Determine the position of the point at which the resultant field is zero .

Two small balls having equal positive charge q coulomb are suspended by two insulating strings of equal length ' l ' meter from hook fixed to stand.The whole setup is taken in a satellite into sapce where there is no gravity. What is the angle between the two strings and the tension in each string?

Q.28. A system of two blocks A and B are connected by an inextensible massless string as shown in the figure. The pulley is massless and frictionless. Initially the system is at rest when, a bullet of mass 'm' moving with a velocity 'u' hits the block 'B' and gets embedded into it. The impulse imparted by tension force to the block of mass 3 m is :

A) $\frac{5mu}{4}$

B) $\frac{4mu}{5}$

C) $\frac{2mu}{5}$

D) $\frac{3mu}{5}$

an electric dipole of dipole moment 20 *10

^{-6}Cm is enclosed by a closed surface .what is the net flux coming out of the surface?(A) ${e}^{2}\overrightarrow{v}$ (B) $-{e}^{2}\overrightarrow{v}$ (C) $-e\overrightarrow{v}$ (D) data insufficient

two fixed point charges +4e and +e units are separated by a distance a .where should the third point charge be placed for it to be in equilibrium ?

$A)t=\frac{\mathrm{\pi ml}}{12J}B)2\frac{J}{m}C)\frac{J}{\sqrt{2}m}D)noneofthese$

how much positive and negative charge is there in a cup of water

uat angle θ to the horizontal. Then horizontal displacement covered by ball as it collides third time to the ground would be, if coefficient of restitution ise:(A) $\left(1+e\right)\frac{{u}^{2}\mathrm{sin}2\theta}{g}$ (B) $e\frac{{\displaystyle {u}^{2}\mathrm{sin}2\theta}}{{\displaystyle g}}$

(C) $\left(1-e\right)\frac{{\displaystyle {u}^{2}\mathrm{sin}2\theta}}{{\displaystyle g}}$ (D) $\left(1+e+{e}^{2}\right)\frac{{\displaystyle {u}^{2}\mathrm{sin}2\theta}}{{\displaystyle g}}$

what is the principle of vernier calipers

Q 3.Two concentric shells of uniform density of mass M_{1}and M_{2}are situated as shown in the figure. The forces experienced by a particle of mass m when placed at positions A, B and C respectively are (given OA = p, OB = q and OC = r)$\left(A\right)zero,G\frac{{M}_{1}m}{{q}^{2}}andG\frac{\left({M}_{1}+{M}_{2}\right)m}{{p}^{2}}\phantom{\rule{0ex}{0ex}}\left(B\right)G\frac{\left({M}_{1}+{M}_{2}\right)m}{{p}^{2}},G\frac{\left({M}_{1}+{M}_{2}\right)m}{{q}^{2}}andG\frac{{M}_{1}m}{{r}^{2}}\phantom{\rule{0ex}{0ex}}\left(C\right)G\frac{{M}_{1}m}{{q}^{2}},G\frac{\left({M}_{1}+{M}_{2}\right)m}{{p}^{2}}andzero\phantom{\rule{0ex}{0ex}}\left(D\right)G\frac{\left({M}_{1}+{M}_{2}\right)m}{{p}^{2}},G\frac{{M}_{1}m}{{q}^{2}},andzero$

electrostatic field lines cannot be discontinuous why?

6.

A circular hole of radius $\frac{\mathrm{R}}{4}$ is made in a

thin uniform disc having mass M and

radius R, as shown in figure. The moment

of inertia of the remaining portion of the

disc about an axis passing through the

point O and perpendicular to the plane of

the disc is :

$\left(1\right)\frac{219{\mathrm{MR}}^{2}}{256}\phantom{\rule{0ex}{0ex}}\left(2\right)\frac{237{\mathrm{MR}}^{2}}{512}\phantom{\rule{0ex}{0ex}}\left(3\right)\frac{19{\mathrm{MR}}^{2}}{512}\phantom{\rule{0ex}{0ex}}\left(4\right)\frac{197{\mathrm{MR}}^{2}}{256}\phantom{\rule{0ex}{0ex}}$

Q. Two point charge ${q}_{1}and{q}_{2}$ are placed at a distance of 50 cm from each other in air, and interact with a certain force. Now the same charges are put in an oil whose relative permittivity is 5. If the interacting force between them is still the same, their separation now is :

(1) 16.6 cm.

(2) 22.3 cm.

(3) 35.0 cm.

(4) 28.4 cm.

Q.6. Which of the following charge can not present on oil drop in Millikan's experiment :

(1) 4.0 $\times {10}^{-19}cb$

(2) 6.0 $\times {10}^{-19}cb$

(3) 10.0 $\times {10}^{-19}cb$

(4) all of them

state Gauss' law in electrostatics.

Q5. Two insulating small spheres are rubbed against each other and then kept at a distance of 4 m apart they attract each other with a force of 3.5 N, then

(i) Calculate the charge on each sphere, and

(ii) Calculate the number of electrons transferred from one sphere to another during the rubbing.

project to study various factors on which the internal resistance emf of a cell depends

a car moving with a speed of 40km/hr can be stopped by applying brakes after at least 2m.If the same car is moving with 80km/hr.What is the least stopping distance?

An electron falls through a distance of 1.5 cm in a uniform electric field of magnitude 2.0 Ã— 10

^{4}N C^{â€“1}in the direction of the field . Then the direction of the field is reversed keeping its magnitude unchanged and a proton falls through the same distance . compute the time of fall in each case.1. zero

2. 5 V/m

3. 10Vm

4. 20 V/m

State and prove

.Gauss Theoremwhat are the physical significance of electric field??

Four charges are placed on corners of a square ABCD, A = Q, B = -2Q, C = +2Q & D = -Q having side of 5cm. If Q is one microcoulomb, then electric field intensity at centre will be

a) 1.02 x 10

^{7}N / C upwardsb) 2.04 x 10

^{7}N / C downwardsc) 2.04 x 10

^{7}N / C upwardsd) 1.02 x 10

^{7}N / C downwardsWhat is the angle between the directions of electric field at any 1) axial point 2) equatorial point due to an electric dipole ?

7. A body having volume V and density attached to the bottom of a container as shown. Density of the liquid is d(>p). Container has a constant upward acceleration a. Tension in the string is

$\left(\mathrm{A}\right)\mathrm{V}\left[\mathrm{Dg}-\mathrm{p}\left(\mathrm{g}+\mathrm{a}\right)\right]\left(\mathrm{B}\right)\mathrm{V}\left(\mathrm{g}+\mathrm{a}\right)\left(\mathrm{g}-\mathrm{p}\right)\left(\mathrm{C}\right)\mathrm{V}\left(\mathrm{d}-\mathrm{p}\right)\mathrm{g}\left(\mathrm{D}\right)\mathrm{None}\mathrm{of}\mathrm{these}$

Find (i) the force on the charge at the centre of shell and at the point A. (ii) the electric flux through the shell.

a semi infinite line charge of linear charge density 'D' has the shape of an infinitely long straight wire whose one end is connected to three-fourth circle of radius 'R' while one of the diameters of 3/4th circle is parallel to the infinitely long straight part.What is the field at the centre of the circle.How?

the sum of two point charges is 7uC. they repel each other with a force of 1N when kept 30cm apart in free space. calculate the value of each charge.

22. A cubical box of wine has a small spout located in one of the bottom corners. When the box is full and placed on a level surface, opening the spout results in a flow of wine with a initial speed of v

_{o}(see figure). When the box is half empty, someone tilts it at 45^{o}so that the spout is at the lowest point (see figure). When the spout is opened the wine will flow out with a speed of$\left(\mathrm{A}\right){\mathrm{V}}_{0}\left(\mathrm{B}\right){\mathrm{V}}_{0}/2\left(\mathrm{C}\right){\mathrm{V}}_{0}/\sqrt{2}\left(\mathrm{D}\right){\mathrm{V}}_{0}/\sqrt[4]{2}$

explain cyclotron in a more elaborate way

If E=6i+3j+4k, calculate the electric flux through a surface of area 20 units in the YZ plane.

mhas charges +qand –qon diametrically opposite points. It remains in equilibrium on a rough inclined plane in the presence of uniform vertical electric field E. The value of E is:(A) $\frac{mg}{q}$ (B) $\frac{mg}{2q}$ (C) $\frac{mg\mathrm{tan}\theta}{2q}$ (D) None

A certain charge Q is divided into two parts q and Q-q which are then seperated by a certain distance.What must q be iin terms of Qto maximise the electrostatics repulsion between the two charges?

Q. Three charges q, 2q and 4q are connected by two strings of equal lengths as shown in figure. What is the ratio of tensions in the strings AB and BC?

(a) 1 : 2

(b) 2 : 1

(c) 1 : 3

(d) 3 : 1

HOW TO DO THIS QUESTION?

The electric field components due to a charge inside the cube of side 0.1 m are as shown:

Where α = 500 N/C − m

E_{y}= 0,E_{z}= 0Calculate (i) the flux through the cube and (ii) the charge inside the cube

what is the source charge and test charge

Why does the electric field inside a dielectric decrease when it is placed in an external electric field?

options :1]epselon 0 2]1/epselon 0 3]epselon 0 x 10^-6 4]1/epselon 0 x 10^-6

how does coulomb force between two point charges depend upon the permitivity of the intervening medium ?

Explain the formulae E = Sigma / Epsilon not.

E is the electric field vector.

Epsilon not is the specific inductive capacity or relative permittivity of vaccum.

Sigma = ? (doubt)

Q. A point charge q $={10}^{-11}$ C is placed at 4 cm above a square plate (8 cm $\times $ 8 cm) having charge density 0.5 $\times $ ${10}^{-8}$ $C/{m}^{2}.$ Find the flux related with it.

(1) 0.188 V-m

(2) 0.12 V-m

(3) 0.288 V-m

(4) 0.388 V-m